>> and down the hall in the science classroom, the normally giggle-indeu giggle-inducing topic of human reproduction turns into a lesson of self control. >> even though there might be some funny stuff here, you know, being able to control the laughing and bringing it back is just as important as any other skill you might ever have in your life. >> self control which is often in really short supply in our society has been proven to be a marker for success later in life. psychologists famously proved that years ago in the hidden camera marshmallow test, one of which is shown here. kids are offered the temptation, the instant gratification of a marshmallow while they're promised seconds if they can just hold off from ringing the bell. >> if you can stay here and wait for me to come back without eating the marshmallow, then you get two marshmallows. >> the kids who were able to marshal their marshmallow self-control and hold out for seconds, would later score about 200 points higher on their s.a.t.s than the kids who gave in. it might just be a marshmallow, it's also a bit of grit in action